A Useful Tool: Effectively used as an angle measurement, rotation angle measurement, acceleration measurement, angular velocity measurement tool, and also features an easy-to-operate digital display. LCD Display: digital color screen and 4 LED lights of the 4 corners for easy reading and use, clear and intuitive. Connect to Your Smartphone: Digital protractor can be connected via BT with the app. The measured value of the digital inclinometer is displayed live on the screen of the mobile device. Easy Carrying: Comes with a light weight and a compact size as well, the convenient storage and carrying enables both indoor and outdoor use. Charger Port: This product is powered by USB interface. Reverse connection or short circuit between signal and ground is strictly prohibited. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Wide Range of Applications: You can use the digital protractor in the follwing application: Interior decoration, construction area, plumbing, floors & stairs, woodwork. Colour:As Shown Material:Nylon + fiberglass Package Contents: 1 * Digital Protractor 1 * USB Charging Cable 1 * User Manual (English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.